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08e0e7c8 DH |
1 | /* Maintain an RxRPC server socket to do AFS communications through |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
5a0e3ad6 | 12 | #include <linux/slab.h> |
08e0e7c8 DH |
13 | #include <net/sock.h> |
14 | #include <net/af_rxrpc.h> | |
15 | #include <rxrpc/packet.h> | |
16 | #include "internal.h" | |
17 | #include "afs_cm.h" | |
18 | ||
19 | static struct socket *afs_socket; /* my RxRPC socket */ | |
20 | static struct workqueue_struct *afs_async_calls; | |
00d3b7a4 DH |
21 | static atomic_t afs_outstanding_calls; |
22 | static atomic_t afs_outstanding_skbs; | |
08e0e7c8 DH |
23 | |
24 | static void afs_wake_up_call_waiter(struct afs_call *); | |
25 | static int afs_wait_for_call_to_complete(struct afs_call *); | |
26 | static void afs_wake_up_async_call(struct afs_call *); | |
27 | static int afs_dont_wait_for_call_to_complete(struct afs_call *); | |
656f88dd | 28 | static void afs_process_async_call(struct afs_call *); |
08e0e7c8 DH |
29 | static void afs_rx_interceptor(struct sock *, unsigned long, struct sk_buff *); |
30 | static int afs_deliver_cm_op_id(struct afs_call *, struct sk_buff *, bool); | |
31 | ||
32 | /* synchronous call management */ | |
33 | const struct afs_wait_mode afs_sync_call = { | |
34 | .rx_wakeup = afs_wake_up_call_waiter, | |
35 | .wait = afs_wait_for_call_to_complete, | |
36 | }; | |
37 | ||
38 | /* asynchronous call management */ | |
39 | const struct afs_wait_mode afs_async_call = { | |
40 | .rx_wakeup = afs_wake_up_async_call, | |
41 | .wait = afs_dont_wait_for_call_to_complete, | |
42 | }; | |
43 | ||
44 | /* asynchronous incoming call management */ | |
45 | static const struct afs_wait_mode afs_async_incoming_call = { | |
46 | .rx_wakeup = afs_wake_up_async_call, | |
47 | }; | |
48 | ||
49 | /* asynchronous incoming call initial processing */ | |
50 | static const struct afs_call_type afs_RXCMxxxx = { | |
00d3b7a4 | 51 | .name = "CB.xxxx", |
08e0e7c8 DH |
52 | .deliver = afs_deliver_cm_op_id, |
53 | .abort_to_error = afs_abort_to_error, | |
54 | }; | |
55 | ||
56 | static void afs_collect_incoming_call(struct work_struct *); | |
57 | ||
58 | static struct sk_buff_head afs_incoming_calls; | |
59 | static DECLARE_WORK(afs_collect_incoming_call_work, afs_collect_incoming_call); | |
60 | ||
150a6b47 NWF |
61 | static void afs_async_workfn(struct work_struct *work) |
62 | { | |
63 | struct afs_call *call = container_of(work, struct afs_call, async_work); | |
64 | ||
656f88dd | 65 | call->async_workfn(call); |
150a6b47 NWF |
66 | } |
67 | ||
2f02f7ae DH |
68 | static int afs_wait_atomic_t(atomic_t *p) |
69 | { | |
70 | schedule(); | |
71 | return 0; | |
72 | } | |
73 | ||
08e0e7c8 DH |
74 | /* |
75 | * open an RxRPC socket and bind it to be a server for callback notifications | |
76 | * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT | |
77 | */ | |
78 | int afs_open_socket(void) | |
79 | { | |
80 | struct sockaddr_rxrpc srx; | |
81 | struct socket *socket; | |
82 | int ret; | |
83 | ||
84 | _enter(""); | |
85 | ||
86 | skb_queue_head_init(&afs_incoming_calls); | |
87 | ||
0e119b41 | 88 | ret = -ENOMEM; |
08e0e7c8 | 89 | afs_async_calls = create_singlethread_workqueue("kafsd"); |
0e119b41 DH |
90 | if (!afs_async_calls) |
91 | goto error_0; | |
08e0e7c8 | 92 | |
eeb1bd5c | 93 | ret = sock_create_kern(&init_net, AF_RXRPC, SOCK_DGRAM, PF_INET, &socket); |
0e119b41 DH |
94 | if (ret < 0) |
95 | goto error_1; | |
08e0e7c8 DH |
96 | |
97 | socket->sk->sk_allocation = GFP_NOFS; | |
98 | ||
99 | /* bind the callback manager's address to make this a server socket */ | |
100 | srx.srx_family = AF_RXRPC; | |
101 | srx.srx_service = CM_SERVICE; | |
102 | srx.transport_type = SOCK_DGRAM; | |
103 | srx.transport_len = sizeof(srx.transport.sin); | |
104 | srx.transport.sin.sin_family = AF_INET; | |
105 | srx.transport.sin.sin_port = htons(AFS_CM_PORT); | |
106 | memset(&srx.transport.sin.sin_addr, 0, | |
107 | sizeof(srx.transport.sin.sin_addr)); | |
108 | ||
109 | ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); | |
0e119b41 DH |
110 | if (ret < 0) |
111 | goto error_2; | |
112 | ||
113 | ret = kernel_listen(socket, INT_MAX); | |
114 | if (ret < 0) | |
115 | goto error_2; | |
08e0e7c8 DH |
116 | |
117 | rxrpc_kernel_intercept_rx_messages(socket, afs_rx_interceptor); | |
118 | ||
119 | afs_socket = socket; | |
120 | _leave(" = 0"); | |
121 | return 0; | |
0e119b41 DH |
122 | |
123 | error_2: | |
124 | sock_release(socket); | |
125 | error_1: | |
126 | destroy_workqueue(afs_async_calls); | |
127 | error_0: | |
128 | _leave(" = %d", ret); | |
129 | return ret; | |
08e0e7c8 DH |
130 | } |
131 | ||
132 | /* | |
133 | * close the RxRPC socket AFS was using | |
134 | */ | |
135 | void afs_close_socket(void) | |
136 | { | |
137 | _enter(""); | |
138 | ||
2f02f7ae DH |
139 | wait_on_atomic_t(&afs_outstanding_calls, afs_wait_atomic_t, |
140 | TASK_UNINTERRUPTIBLE); | |
141 | _debug("no outstanding calls"); | |
142 | ||
08e0e7c8 DH |
143 | sock_release(afs_socket); |
144 | ||
145 | _debug("dework"); | |
146 | destroy_workqueue(afs_async_calls); | |
00d3b7a4 DH |
147 | |
148 | ASSERTCMP(atomic_read(&afs_outstanding_skbs), ==, 0); | |
08e0e7c8 DH |
149 | _leave(""); |
150 | } | |
151 | ||
00d3b7a4 DH |
152 | /* |
153 | * note that the data in a socket buffer is now delivered and that the buffer | |
154 | * should be freed | |
155 | */ | |
156 | static void afs_data_delivered(struct sk_buff *skb) | |
157 | { | |
158 | if (!skb) { | |
159 | _debug("DLVR NULL [%d]", atomic_read(&afs_outstanding_skbs)); | |
160 | dump_stack(); | |
161 | } else { | |
162 | _debug("DLVR %p{%u} [%d]", | |
163 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); | |
164 | if (atomic_dec_return(&afs_outstanding_skbs) == -1) | |
165 | BUG(); | |
166 | rxrpc_kernel_data_delivered(skb); | |
167 | } | |
168 | } | |
169 | ||
170 | /* | |
171 | * free a socket buffer | |
172 | */ | |
173 | static void afs_free_skb(struct sk_buff *skb) | |
174 | { | |
175 | if (!skb) { | |
176 | _debug("FREE NULL [%d]", atomic_read(&afs_outstanding_skbs)); | |
177 | dump_stack(); | |
178 | } else { | |
179 | _debug("FREE %p{%u} [%d]", | |
180 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); | |
181 | if (atomic_dec_return(&afs_outstanding_skbs) == -1) | |
182 | BUG(); | |
183 | rxrpc_kernel_free_skb(skb); | |
184 | } | |
185 | } | |
186 | ||
187 | /* | |
188 | * free a call | |
189 | */ | |
190 | static void afs_free_call(struct afs_call *call) | |
191 | { | |
192 | _debug("DONE %p{%s} [%d]", | |
193 | call, call->type->name, atomic_read(&afs_outstanding_calls)); | |
00d3b7a4 DH |
194 | |
195 | ASSERTCMP(call->rxcall, ==, NULL); | |
196 | ASSERT(!work_pending(&call->async_work)); | |
197 | ASSERT(skb_queue_empty(&call->rx_queue)); | |
198 | ASSERT(call->type->name != NULL); | |
199 | ||
200 | kfree(call->request); | |
201 | kfree(call); | |
2f02f7ae DH |
202 | |
203 | if (atomic_dec_and_test(&afs_outstanding_calls)) | |
204 | wake_up_atomic_t(&afs_outstanding_calls); | |
00d3b7a4 DH |
205 | } |
206 | ||
6c67c7c3 | 207 | /* |
6cf12869 | 208 | * End a call but do not free it |
6c67c7c3 | 209 | */ |
6cf12869 | 210 | static void afs_end_call_nofree(struct afs_call *call) |
6c67c7c3 DH |
211 | { |
212 | if (call->rxcall) { | |
213 | rxrpc_kernel_end_call(call->rxcall); | |
214 | call->rxcall = NULL; | |
215 | } | |
6cf12869 NWF |
216 | if (call->type->destructor) |
217 | call->type->destructor(call); | |
218 | } | |
219 | ||
220 | /* | |
221 | * End a call and free it | |
222 | */ | |
223 | static void afs_end_call(struct afs_call *call) | |
224 | { | |
225 | afs_end_call_nofree(call); | |
6c67c7c3 DH |
226 | afs_free_call(call); |
227 | } | |
228 | ||
08e0e7c8 DH |
229 | /* |
230 | * allocate a call with flat request and reply buffers | |
231 | */ | |
232 | struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type, | |
233 | size_t request_size, size_t reply_size) | |
234 | { | |
235 | struct afs_call *call; | |
236 | ||
237 | call = kzalloc(sizeof(*call), GFP_NOFS); | |
238 | if (!call) | |
239 | goto nomem_call; | |
240 | ||
00d3b7a4 DH |
241 | _debug("CALL %p{%s} [%d]", |
242 | call, type->name, atomic_read(&afs_outstanding_calls)); | |
243 | atomic_inc(&afs_outstanding_calls); | |
244 | ||
245 | call->type = type; | |
246 | call->request_size = request_size; | |
247 | call->reply_max = reply_size; | |
248 | ||
08e0e7c8 DH |
249 | if (request_size) { |
250 | call->request = kmalloc(request_size, GFP_NOFS); | |
251 | if (!call->request) | |
00d3b7a4 | 252 | goto nomem_free; |
08e0e7c8 DH |
253 | } |
254 | ||
255 | if (reply_size) { | |
256 | call->buffer = kmalloc(reply_size, GFP_NOFS); | |
257 | if (!call->buffer) | |
00d3b7a4 | 258 | goto nomem_free; |
08e0e7c8 DH |
259 | } |
260 | ||
08e0e7c8 DH |
261 | init_waitqueue_head(&call->waitq); |
262 | skb_queue_head_init(&call->rx_queue); | |
263 | return call; | |
264 | ||
00d3b7a4 DH |
265 | nomem_free: |
266 | afs_free_call(call); | |
08e0e7c8 DH |
267 | nomem_call: |
268 | return NULL; | |
269 | } | |
270 | ||
271 | /* | |
272 | * clean up a call with flat buffer | |
273 | */ | |
274 | void afs_flat_call_destructor(struct afs_call *call) | |
275 | { | |
276 | _enter(""); | |
277 | ||
278 | kfree(call->request); | |
279 | call->request = NULL; | |
280 | kfree(call->buffer); | |
281 | call->buffer = NULL; | |
282 | } | |
283 | ||
31143d5d DH |
284 | /* |
285 | * attach the data from a bunch of pages on an inode to a call | |
286 | */ | |
c1206a2c AB |
287 | static int afs_send_pages(struct afs_call *call, struct msghdr *msg, |
288 | struct kvec *iov) | |
31143d5d DH |
289 | { |
290 | struct page *pages[8]; | |
291 | unsigned count, n, loop, offset, to; | |
292 | pgoff_t first = call->first, last = call->last; | |
293 | int ret; | |
294 | ||
295 | _enter(""); | |
296 | ||
297 | offset = call->first_offset; | |
298 | call->first_offset = 0; | |
299 | ||
300 | do { | |
301 | _debug("attach %lx-%lx", first, last); | |
302 | ||
303 | count = last - first + 1; | |
304 | if (count > ARRAY_SIZE(pages)) | |
305 | count = ARRAY_SIZE(pages); | |
306 | n = find_get_pages_contig(call->mapping, first, count, pages); | |
307 | ASSERTCMP(n, ==, count); | |
308 | ||
309 | loop = 0; | |
310 | do { | |
311 | msg->msg_flags = 0; | |
312 | to = PAGE_SIZE; | |
313 | if (first + loop >= last) | |
314 | to = call->last_to; | |
315 | else | |
316 | msg->msg_flags = MSG_MORE; | |
317 | iov->iov_base = kmap(pages[loop]) + offset; | |
318 | iov->iov_len = to - offset; | |
319 | offset = 0; | |
320 | ||
321 | _debug("- range %u-%u%s", | |
322 | offset, to, msg->msg_flags ? " [more]" : ""); | |
2e90b1c4 AV |
323 | iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, |
324 | iov, 1, to - offset); | |
31143d5d DH |
325 | |
326 | /* have to change the state *before* sending the last | |
327 | * packet as RxRPC might give us the reply before it | |
328 | * returns from sending the request */ | |
329 | if (first + loop >= last) | |
330 | call->state = AFS_CALL_AWAIT_REPLY; | |
331 | ret = rxrpc_kernel_send_data(call->rxcall, msg, | |
332 | to - offset); | |
333 | kunmap(pages[loop]); | |
334 | if (ret < 0) | |
335 | break; | |
336 | } while (++loop < count); | |
337 | first += count; | |
338 | ||
339 | for (loop = 0; loop < count; loop++) | |
340 | put_page(pages[loop]); | |
341 | if (ret < 0) | |
342 | break; | |
5bbf5d39 | 343 | } while (first <= last); |
31143d5d DH |
344 | |
345 | _leave(" = %d", ret); | |
346 | return ret; | |
347 | } | |
348 | ||
08e0e7c8 DH |
349 | /* |
350 | * initiate a call | |
351 | */ | |
352 | int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, | |
353 | const struct afs_wait_mode *wait_mode) | |
354 | { | |
355 | struct sockaddr_rxrpc srx; | |
356 | struct rxrpc_call *rxcall; | |
357 | struct msghdr msg; | |
358 | struct kvec iov[1]; | |
359 | int ret; | |
c0173863 | 360 | struct sk_buff *skb; |
08e0e7c8 DH |
361 | |
362 | _enter("%x,{%d},", addr->s_addr, ntohs(call->port)); | |
363 | ||
00d3b7a4 DH |
364 | ASSERT(call->type != NULL); |
365 | ASSERT(call->type->name != NULL); | |
366 | ||
31143d5d DH |
367 | _debug("____MAKE %p{%s,%x} [%d]____", |
368 | call, call->type->name, key_serial(call->key), | |
369 | atomic_read(&afs_outstanding_calls)); | |
00d3b7a4 | 370 | |
08e0e7c8 | 371 | call->wait_mode = wait_mode; |
150a6b47 NWF |
372 | call->async_workfn = afs_process_async_call; |
373 | INIT_WORK(&call->async_work, afs_async_workfn); | |
08e0e7c8 DH |
374 | |
375 | memset(&srx, 0, sizeof(srx)); | |
376 | srx.srx_family = AF_RXRPC; | |
377 | srx.srx_service = call->service_id; | |
378 | srx.transport_type = SOCK_DGRAM; | |
379 | srx.transport_len = sizeof(srx.transport.sin); | |
380 | srx.transport.sin.sin_family = AF_INET; | |
381 | srx.transport.sin.sin_port = call->port; | |
382 | memcpy(&srx.transport.sin.sin_addr, addr, 4); | |
383 | ||
384 | /* create a call */ | |
385 | rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key, | |
386 | (unsigned long) call, gfp); | |
00d3b7a4 | 387 | call->key = NULL; |
08e0e7c8 DH |
388 | if (IS_ERR(rxcall)) { |
389 | ret = PTR_ERR(rxcall); | |
390 | goto error_kill_call; | |
391 | } | |
392 | ||
393 | call->rxcall = rxcall; | |
394 | ||
395 | /* send the request */ | |
396 | iov[0].iov_base = call->request; | |
397 | iov[0].iov_len = call->request_size; | |
398 | ||
399 | msg.msg_name = NULL; | |
400 | msg.msg_namelen = 0; | |
2e90b1c4 | 401 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, |
c0371da6 | 402 | call->request_size); |
08e0e7c8 DH |
403 | msg.msg_control = NULL; |
404 | msg.msg_controllen = 0; | |
31143d5d | 405 | msg.msg_flags = (call->send_pages ? MSG_MORE : 0); |
08e0e7c8 DH |
406 | |
407 | /* have to change the state *before* sending the last packet as RxRPC | |
408 | * might give us the reply before it returns from sending the | |
409 | * request */ | |
31143d5d DH |
410 | if (!call->send_pages) |
411 | call->state = AFS_CALL_AWAIT_REPLY; | |
08e0e7c8 DH |
412 | ret = rxrpc_kernel_send_data(rxcall, &msg, call->request_size); |
413 | if (ret < 0) | |
414 | goto error_do_abort; | |
415 | ||
31143d5d DH |
416 | if (call->send_pages) { |
417 | ret = afs_send_pages(call, &msg, iov); | |
418 | if (ret < 0) | |
419 | goto error_do_abort; | |
420 | } | |
421 | ||
08e0e7c8 DH |
422 | /* at this point, an async call may no longer exist as it may have |
423 | * already completed */ | |
424 | return wait_mode->wait(call); | |
425 | ||
426 | error_do_abort: | |
427 | rxrpc_kernel_abort_call(rxcall, RX_USER_ABORT); | |
c0173863 AB |
428 | while ((skb = skb_dequeue(&call->rx_queue))) |
429 | afs_free_skb(skb); | |
08e0e7c8 | 430 | error_kill_call: |
6c67c7c3 | 431 | afs_end_call(call); |
08e0e7c8 DH |
432 | _leave(" = %d", ret); |
433 | return ret; | |
434 | } | |
435 | ||
436 | /* | |
dc44b3a0 DH |
437 | * Handles intercepted messages that were arriving in the socket's Rx queue. |
438 | * | |
439 | * Called from the AF_RXRPC call processor in waitqueue process context. For | |
440 | * each call, it is guaranteed this will be called in order of packet to be | |
441 | * delivered. | |
08e0e7c8 DH |
442 | */ |
443 | static void afs_rx_interceptor(struct sock *sk, unsigned long user_call_ID, | |
444 | struct sk_buff *skb) | |
445 | { | |
446 | struct afs_call *call = (struct afs_call *) user_call_ID; | |
447 | ||
448 | _enter("%p,,%u", call, skb->mark); | |
449 | ||
00d3b7a4 DH |
450 | _debug("ICPT %p{%u} [%d]", |
451 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); | |
452 | ||
08e0e7c8 | 453 | ASSERTCMP(sk, ==, afs_socket->sk); |
00d3b7a4 | 454 | atomic_inc(&afs_outstanding_skbs); |
08e0e7c8 DH |
455 | |
456 | if (!call) { | |
457 | /* its an incoming call for our callback service */ | |
00d3b7a4 | 458 | skb_queue_tail(&afs_incoming_calls, skb); |
0ad53eee | 459 | queue_work(afs_wq, &afs_collect_incoming_call_work); |
08e0e7c8 DH |
460 | } else { |
461 | /* route the messages directly to the appropriate call */ | |
00d3b7a4 | 462 | skb_queue_tail(&call->rx_queue, skb); |
08e0e7c8 DH |
463 | call->wait_mode->rx_wakeup(call); |
464 | } | |
465 | ||
466 | _leave(""); | |
467 | } | |
468 | ||
469 | /* | |
470 | * deliver messages to a call | |
471 | */ | |
472 | static void afs_deliver_to_call(struct afs_call *call) | |
473 | { | |
474 | struct sk_buff *skb; | |
475 | bool last; | |
476 | u32 abort_code; | |
477 | int ret; | |
478 | ||
479 | _enter(""); | |
480 | ||
481 | while ((call->state == AFS_CALL_AWAIT_REPLY || | |
482 | call->state == AFS_CALL_AWAIT_OP_ID || | |
483 | call->state == AFS_CALL_AWAIT_REQUEST || | |
484 | call->state == AFS_CALL_AWAIT_ACK) && | |
485 | (skb = skb_dequeue(&call->rx_queue))) { | |
486 | switch (skb->mark) { | |
487 | case RXRPC_SKB_MARK_DATA: | |
488 | _debug("Rcv DATA"); | |
489 | last = rxrpc_kernel_is_data_last(skb); | |
490 | ret = call->type->deliver(call, skb, last); | |
491 | switch (ret) { | |
492 | case 0: | |
493 | if (last && | |
494 | call->state == AFS_CALL_AWAIT_REPLY) | |
495 | call->state = AFS_CALL_COMPLETE; | |
496 | break; | |
497 | case -ENOTCONN: | |
498 | abort_code = RX_CALL_DEAD; | |
499 | goto do_abort; | |
500 | case -ENOTSUPP: | |
501 | abort_code = RX_INVALID_OPERATION; | |
502 | goto do_abort; | |
503 | default: | |
504 | abort_code = RXGEN_CC_UNMARSHAL; | |
505 | if (call->state != AFS_CALL_AWAIT_REPLY) | |
506 | abort_code = RXGEN_SS_UNMARSHAL; | |
507 | do_abort: | |
508 | rxrpc_kernel_abort_call(call->rxcall, | |
509 | abort_code); | |
510 | call->error = ret; | |
511 | call->state = AFS_CALL_ERROR; | |
512 | break; | |
513 | } | |
00d3b7a4 | 514 | afs_data_delivered(skb); |
08e0e7c8 | 515 | skb = NULL; |
00d3b7a4 | 516 | continue; |
08e0e7c8 DH |
517 | case RXRPC_SKB_MARK_FINAL_ACK: |
518 | _debug("Rcv ACK"); | |
519 | call->state = AFS_CALL_COMPLETE; | |
520 | break; | |
521 | case RXRPC_SKB_MARK_BUSY: | |
522 | _debug("Rcv BUSY"); | |
523 | call->error = -EBUSY; | |
524 | call->state = AFS_CALL_BUSY; | |
525 | break; | |
526 | case RXRPC_SKB_MARK_REMOTE_ABORT: | |
527 | abort_code = rxrpc_kernel_get_abort_code(skb); | |
528 | call->error = call->type->abort_to_error(abort_code); | |
529 | call->state = AFS_CALL_ABORTED; | |
530 | _debug("Rcv ABORT %u -> %d", abort_code, call->error); | |
531 | break; | |
dc44b3a0 DH |
532 | case RXRPC_SKB_MARK_LOCAL_ABORT: |
533 | abort_code = rxrpc_kernel_get_abort_code(skb); | |
534 | call->error = call->type->abort_to_error(abort_code); | |
535 | call->state = AFS_CALL_ABORTED; | |
536 | _debug("Loc ABORT %u -> %d", abort_code, call->error); | |
537 | break; | |
08e0e7c8 DH |
538 | case RXRPC_SKB_MARK_NET_ERROR: |
539 | call->error = -rxrpc_kernel_get_error_number(skb); | |
540 | call->state = AFS_CALL_ERROR; | |
541 | _debug("Rcv NET ERROR %d", call->error); | |
542 | break; | |
543 | case RXRPC_SKB_MARK_LOCAL_ERROR: | |
544 | call->error = -rxrpc_kernel_get_error_number(skb); | |
545 | call->state = AFS_CALL_ERROR; | |
546 | _debug("Rcv LOCAL ERROR %d", call->error); | |
547 | break; | |
548 | default: | |
549 | BUG(); | |
550 | break; | |
551 | } | |
552 | ||
00d3b7a4 | 553 | afs_free_skb(skb); |
08e0e7c8 DH |
554 | } |
555 | ||
556 | /* make sure the queue is empty if the call is done with (we might have | |
557 | * aborted the call early because of an unmarshalling error) */ | |
558 | if (call->state >= AFS_CALL_COMPLETE) { | |
559 | while ((skb = skb_dequeue(&call->rx_queue))) | |
00d3b7a4 | 560 | afs_free_skb(skb); |
6c67c7c3 DH |
561 | if (call->incoming) |
562 | afs_end_call(call); | |
08e0e7c8 DH |
563 | } |
564 | ||
565 | _leave(""); | |
566 | } | |
567 | ||
568 | /* | |
569 | * wait synchronously for a call to complete | |
570 | */ | |
571 | static int afs_wait_for_call_to_complete(struct afs_call *call) | |
572 | { | |
573 | struct sk_buff *skb; | |
574 | int ret; | |
575 | ||
576 | DECLARE_WAITQUEUE(myself, current); | |
577 | ||
578 | _enter(""); | |
579 | ||
580 | add_wait_queue(&call->waitq, &myself); | |
581 | for (;;) { | |
582 | set_current_state(TASK_INTERRUPTIBLE); | |
583 | ||
584 | /* deliver any messages that are in the queue */ | |
585 | if (!skb_queue_empty(&call->rx_queue)) { | |
586 | __set_current_state(TASK_RUNNING); | |
587 | afs_deliver_to_call(call); | |
588 | continue; | |
589 | } | |
590 | ||
591 | ret = call->error; | |
592 | if (call->state >= AFS_CALL_COMPLETE) | |
593 | break; | |
594 | ret = -EINTR; | |
595 | if (signal_pending(current)) | |
596 | break; | |
597 | schedule(); | |
598 | } | |
599 | ||
600 | remove_wait_queue(&call->waitq, &myself); | |
601 | __set_current_state(TASK_RUNNING); | |
602 | ||
603 | /* kill the call */ | |
604 | if (call->state < AFS_CALL_COMPLETE) { | |
605 | _debug("call incomplete"); | |
606 | rxrpc_kernel_abort_call(call->rxcall, RX_CALL_DEAD); | |
607 | while ((skb = skb_dequeue(&call->rx_queue))) | |
00d3b7a4 | 608 | afs_free_skb(skb); |
08e0e7c8 DH |
609 | } |
610 | ||
611 | _debug("call complete"); | |
6c67c7c3 | 612 | afs_end_call(call); |
08e0e7c8 DH |
613 | _leave(" = %d", ret); |
614 | return ret; | |
615 | } | |
616 | ||
617 | /* | |
618 | * wake up a waiting call | |
619 | */ | |
620 | static void afs_wake_up_call_waiter(struct afs_call *call) | |
621 | { | |
622 | wake_up(&call->waitq); | |
623 | } | |
624 | ||
625 | /* | |
626 | * wake up an asynchronous call | |
627 | */ | |
628 | static void afs_wake_up_async_call(struct afs_call *call) | |
629 | { | |
630 | _enter(""); | |
631 | queue_work(afs_async_calls, &call->async_work); | |
632 | } | |
633 | ||
634 | /* | |
635 | * put a call into asynchronous mode | |
636 | * - mustn't touch the call descriptor as the call my have completed by the | |
637 | * time we get here | |
638 | */ | |
639 | static int afs_dont_wait_for_call_to_complete(struct afs_call *call) | |
640 | { | |
641 | _enter(""); | |
642 | return -EINPROGRESS; | |
643 | } | |
644 | ||
645 | /* | |
646 | * delete an asynchronous call | |
647 | */ | |
656f88dd | 648 | static void afs_delete_async_call(struct afs_call *call) |
08e0e7c8 | 649 | { |
08e0e7c8 DH |
650 | _enter(""); |
651 | ||
00d3b7a4 | 652 | afs_free_call(call); |
08e0e7c8 DH |
653 | |
654 | _leave(""); | |
655 | } | |
656 | ||
657 | /* | |
658 | * perform processing on an asynchronous call | |
659 | * - on a multiple-thread workqueue this work item may try to run on several | |
660 | * CPUs at the same time | |
661 | */ | |
656f88dd | 662 | static void afs_process_async_call(struct afs_call *call) |
08e0e7c8 | 663 | { |
08e0e7c8 DH |
664 | _enter(""); |
665 | ||
666 | if (!skb_queue_empty(&call->rx_queue)) | |
667 | afs_deliver_to_call(call); | |
668 | ||
669 | if (call->state >= AFS_CALL_COMPLETE && call->wait_mode) { | |
670 | if (call->wait_mode->async_complete) | |
671 | call->wait_mode->async_complete(call->reply, | |
672 | call->error); | |
673 | call->reply = NULL; | |
674 | ||
675 | /* kill the call */ | |
6cf12869 | 676 | afs_end_call_nofree(call); |
08e0e7c8 DH |
677 | |
678 | /* we can't just delete the call because the work item may be | |
679 | * queued */ | |
05949945 | 680 | call->async_workfn = afs_delete_async_call; |
08e0e7c8 DH |
681 | queue_work(afs_async_calls, &call->async_work); |
682 | } | |
683 | ||
684 | _leave(""); | |
685 | } | |
686 | ||
687 | /* | |
688 | * empty a socket buffer into a flat reply buffer | |
689 | */ | |
690 | void afs_transfer_reply(struct afs_call *call, struct sk_buff *skb) | |
691 | { | |
692 | size_t len = skb->len; | |
693 | ||
694 | if (skb_copy_bits(skb, 0, call->buffer + call->reply_size, len) < 0) | |
695 | BUG(); | |
696 | call->reply_size += len; | |
697 | } | |
698 | ||
699 | /* | |
700 | * accept the backlog of incoming calls | |
701 | */ | |
702 | static void afs_collect_incoming_call(struct work_struct *work) | |
703 | { | |
704 | struct rxrpc_call *rxcall; | |
705 | struct afs_call *call = NULL; | |
706 | struct sk_buff *skb; | |
707 | ||
708 | while ((skb = skb_dequeue(&afs_incoming_calls))) { | |
709 | _debug("new call"); | |
710 | ||
711 | /* don't need the notification */ | |
00d3b7a4 | 712 | afs_free_skb(skb); |
08e0e7c8 DH |
713 | |
714 | if (!call) { | |
715 | call = kzalloc(sizeof(struct afs_call), GFP_KERNEL); | |
716 | if (!call) { | |
717 | rxrpc_kernel_reject_call(afs_socket); | |
718 | return; | |
719 | } | |
720 | ||
05949945 TH |
721 | call->async_workfn = afs_process_async_call; |
722 | INIT_WORK(&call->async_work, afs_async_workfn); | |
08e0e7c8 DH |
723 | call->wait_mode = &afs_async_incoming_call; |
724 | call->type = &afs_RXCMxxxx; | |
725 | init_waitqueue_head(&call->waitq); | |
726 | skb_queue_head_init(&call->rx_queue); | |
727 | call->state = AFS_CALL_AWAIT_OP_ID; | |
00d3b7a4 DH |
728 | |
729 | _debug("CALL %p{%s} [%d]", | |
730 | call, call->type->name, | |
731 | atomic_read(&afs_outstanding_calls)); | |
732 | atomic_inc(&afs_outstanding_calls); | |
08e0e7c8 DH |
733 | } |
734 | ||
735 | rxcall = rxrpc_kernel_accept_call(afs_socket, | |
736 | (unsigned long) call); | |
737 | if (!IS_ERR(rxcall)) { | |
738 | call->rxcall = rxcall; | |
739 | call = NULL; | |
740 | } | |
741 | } | |
742 | ||
00d3b7a4 DH |
743 | if (call) |
744 | afs_free_call(call); | |
08e0e7c8 DH |
745 | } |
746 | ||
747 | /* | |
748 | * grab the operation ID from an incoming cache manager call | |
749 | */ | |
750 | static int afs_deliver_cm_op_id(struct afs_call *call, struct sk_buff *skb, | |
751 | bool last) | |
752 | { | |
753 | size_t len = skb->len; | |
754 | void *oibuf = (void *) &call->operation_ID; | |
755 | ||
756 | _enter("{%u},{%zu},%d", call->offset, len, last); | |
757 | ||
758 | ASSERTCMP(call->offset, <, 4); | |
759 | ||
760 | /* the operation ID forms the first four bytes of the request data */ | |
761 | len = min_t(size_t, len, 4 - call->offset); | |
762 | if (skb_copy_bits(skb, 0, oibuf + call->offset, len) < 0) | |
763 | BUG(); | |
764 | if (!pskb_pull(skb, len)) | |
765 | BUG(); | |
766 | call->offset += len; | |
767 | ||
768 | if (call->offset < 4) { | |
769 | if (last) { | |
770 | _leave(" = -EBADMSG [op ID short]"); | |
771 | return -EBADMSG; | |
772 | } | |
773 | _leave(" = 0 [incomplete]"); | |
774 | return 0; | |
775 | } | |
776 | ||
777 | call->state = AFS_CALL_AWAIT_REQUEST; | |
778 | ||
779 | /* ask the cache manager to route the call (it'll change the call type | |
780 | * if successful) */ | |
781 | if (!afs_cm_incoming_call(call)) | |
782 | return -ENOTSUPP; | |
783 | ||
784 | /* pass responsibility for the remainer of this message off to the | |
785 | * cache manager op */ | |
786 | return call->type->deliver(call, skb, last); | |
787 | } | |
788 | ||
789 | /* | |
790 | * send an empty reply | |
791 | */ | |
792 | void afs_send_empty_reply(struct afs_call *call) | |
793 | { | |
794 | struct msghdr msg; | |
08e0e7c8 DH |
795 | |
796 | _enter(""); | |
797 | ||
08e0e7c8 DH |
798 | msg.msg_name = NULL; |
799 | msg.msg_namelen = 0; | |
bfd4e956 | 800 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, NULL, 0, 0); |
08e0e7c8 DH |
801 | msg.msg_control = NULL; |
802 | msg.msg_controllen = 0; | |
803 | msg.msg_flags = 0; | |
804 | ||
805 | call->state = AFS_CALL_AWAIT_ACK; | |
806 | switch (rxrpc_kernel_send_data(call->rxcall, &msg, 0)) { | |
807 | case 0: | |
808 | _leave(" [replied]"); | |
809 | return; | |
810 | ||
811 | case -ENOMEM: | |
812 | _debug("oom"); | |
813 | rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT); | |
814 | default: | |
6c67c7c3 | 815 | afs_end_call(call); |
08e0e7c8 DH |
816 | _leave(" [error]"); |
817 | return; | |
818 | } | |
819 | } | |
820 | ||
b908fe6b DH |
821 | /* |
822 | * send a simple reply | |
823 | */ | |
824 | void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) | |
825 | { | |
826 | struct msghdr msg; | |
2e90b1c4 | 827 | struct kvec iov[1]; |
bd6dc742 | 828 | int n; |
b908fe6b DH |
829 | |
830 | _enter(""); | |
831 | ||
832 | iov[0].iov_base = (void *) buf; | |
833 | iov[0].iov_len = len; | |
834 | msg.msg_name = NULL; | |
835 | msg.msg_namelen = 0; | |
2e90b1c4 | 836 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, len); |
b908fe6b DH |
837 | msg.msg_control = NULL; |
838 | msg.msg_controllen = 0; | |
839 | msg.msg_flags = 0; | |
840 | ||
841 | call->state = AFS_CALL_AWAIT_ACK; | |
bd6dc742 DH |
842 | n = rxrpc_kernel_send_data(call->rxcall, &msg, len); |
843 | if (n >= 0) { | |
6c67c7c3 | 844 | /* Success */ |
b908fe6b DH |
845 | _leave(" [replied]"); |
846 | return; | |
bd6dc742 | 847 | } |
6c67c7c3 | 848 | |
bd6dc742 | 849 | if (n == -ENOMEM) { |
b908fe6b DH |
850 | _debug("oom"); |
851 | rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT); | |
b908fe6b | 852 | } |
6c67c7c3 | 853 | afs_end_call(call); |
bd6dc742 | 854 | _leave(" [error]"); |
b908fe6b DH |
855 | } |
856 | ||
08e0e7c8 DH |
857 | /* |
858 | * extract a piece of data from the received data socket buffers | |
859 | */ | |
860 | int afs_extract_data(struct afs_call *call, struct sk_buff *skb, | |
861 | bool last, void *buf, size_t count) | |
862 | { | |
863 | size_t len = skb->len; | |
864 | ||
865 | _enter("{%u},{%zu},%d,,%zu", call->offset, len, last, count); | |
866 | ||
867 | ASSERTCMP(call->offset, <, count); | |
868 | ||
869 | len = min_t(size_t, len, count - call->offset); | |
870 | if (skb_copy_bits(skb, 0, buf + call->offset, len) < 0 || | |
871 | !pskb_pull(skb, len)) | |
872 | BUG(); | |
873 | call->offset += len; | |
874 | ||
875 | if (call->offset < count) { | |
876 | if (last) { | |
b1bdb691 | 877 | _leave(" = -EBADMSG [%d < %zu]", call->offset, count); |
08e0e7c8 DH |
878 | return -EBADMSG; |
879 | } | |
880 | _leave(" = -EAGAIN"); | |
881 | return -EAGAIN; | |
882 | } | |
883 | return 0; | |
884 | } |